From: Helge Deller <deller@gmx.de>
Date: Fri, 19 May 2023 10:12:06 +0000 (+0200)
Subject: parisc: Use num_present_cpus() in alternative patching code
X-Git-Tag: baikal/aarch64/sdk6.2~89
X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=914b577bb3e81ed2555935bb62187bd9696f7301;p=kernel.git

parisc: Use num_present_cpus() in alternative patching code

commit b6405f0829d7b1dd926ba3ca5f691cab835abfaa upstream.

When patching the kernel code some alternatives depend on SMP vs. !SMP.
Use the value of num_present_cpus() instead of num_online_cpus() to
decide, otherwise we may run into issues if and additional CPU is
enabled after having loaded a module while only one CPU was enabled.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: <stable@vger.kernel.org> # v6.1+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/arch/parisc/kernel/alternative.c b/arch/parisc/kernel/alternative.c
index 66f5672c70bd4..25c4d6c3375db 100644
--- a/arch/parisc/kernel/alternative.c
+++ b/arch/parisc/kernel/alternative.c
@@ -25,7 +25,7 @@ void __init_or_module apply_alternatives(struct alt_instr *start,
 {
 	struct alt_instr *entry;
 	int index = 0, applied = 0;
-	int num_cpus = num_online_cpus();
+	int num_cpus = num_present_cpus();
 	u16 cond_check;
 
 	cond_check = ALT_COND_ALWAYS |